Details

Simultaneous Nα/α-carboxyl protection can be readily achieved by oxazolidine formation with aldehydes. The product obtained from Fmoc-Glu-OH, paraformaldehyde and TosOH as catalyst has been converted into Dab derivatives, γ-diazomethyl ketones, Nγ-glycosylated Gln, and N'-glycosylated Dab Nγ-ureas.